Property Value

If property assigned to AsAttachment,
RTF (rich-text format) body of message is converted into .RTF attachment named "richbody.rtf" which is added
to the resulting .EML message into Attachments collection. If you, however,
need this body to be added to BodyParts collection,
where plain-text and HTML bodies usually reside, set this property value to AsBodyPart before making the conversion. This is useful if you need to get the contents
of the RTF body as a string (for instance, if you assign its value to Rtf property to display it
in the RichTextBox control).